Friction lining and method for manufacturing a friction lining

Abstract

In the case of a friction lining, intended in particular for brake systems and comprising a friction element consisting of asbestos-free friction lining material and an abrasive element consisting of abrasive material with a thermosetting binder on the basis of natural or synthetic resin, it is provided that an abrasive element is incorporated in the friction element which, as wear of the friction lining advances, enables the frictional properties of the surface which presses against the lining to be regenerated at intervals.

What is claimed is: 
     
       1. A friction lining for refurbishing a frictional surface of a braking means comprising a layer shaped friction element comprising an asbestos-free friction lining material and a layer shaped abrasive element comprising abrasive material with a thermo-setting binding agent of natural or synthetic resin, characterized in that said abrasive element (6) is arranged, as an intermediate layer, between successive friction element layers (4) whereby upon the wearing away of a friction layer element (4), a successive abrasive element (6) is exposed for abrading away and smoothing said frictional surface thereby maintaining said surface in an optimum state. 
     
     
       2. The friction lining according to claim 1, characterized in that an additional abrasive element (6) extends, in the form of a strip, starting from the surface of said friction element (1), over the entire width orthogonally to the direction of movement of an associated brake disk into the depth of the friction element (1). 
     
     
       3. The friction lining according to claim 1, characterized in that said abrasive element (6) is fibre-reinforced with a percentage by weight/volume of about 1 to 30%. 
     
     
       4. The friction lining according to claim 3, characterized in that said fibre-reinforced abrasive element (6) contains aramide fibres. of about 1 to 30%, preferably 5 to 20%. 
     
     
       5. The friction lining according to claim 3, characterized in that said fibre-reinforced abrasive element (6) contains aramide fibres. 
     
     
       6. The friction lining according to claim 3, characterized in that said fibre-reinforced abrasive element (6) contains carbon fibres. 
     
     
       7. The friction lining according to claim 3, characterized in that said fibre-reinforced abrasive element (6) contains a mixture of aramide fibres, basalt fibres, natural mineral fibres, synthetic mineral fibres, glass fibres, ceramic fibres or carbon fibres, and in that the coefficient of friction of the friction element (4) is achieved by the ratio of the admixed fibres. 
     
     
       8. The friction lining according to claim 1 characterized in that said abrasive element (6) is fibre-reinforced with a percentage by weight/volume of about 5 to 20%. 
     
     
       9. The friction lining according to claim 1 wherein all layers exhibit substantially the said coefficient of friction. 
     
     
       10. A method of manufacturing friction linings by compacting an asbestos-free friction lining material to form friction element layers, characterized by separately manufacturing a layer-shaped abrasive element by extruding, pressing or punching and by subsequently compacting the layer-shaped abrasive element, as an intermediate layer, together with several friction element layers whereby in use the wearing away of a friction element layer exposes a successive abrasive element for abrading away and smoothing an associated frictional surface thereby maintaining said surface in an optimum state. 
     
     
       11. The friction lining manufacturing method according to claim 8 wherein all layers exhibit substantially the same coefficient of friction.